function h=MT_draw_game_trace(G)
if G.draw==0,
    h=[];
    return;
end;
w=1;
p1=(1+w)*G.P{1}.pos-w*G.P{2}.pos;
p2=(1+w)*G.P{2}.pos-w*G.P{1}.pos;
x=[p1(1),p2(1)];
y=[p1(2),p2(2)];
h=plot(x,y,'m:');

